title: An electrochemical route to quantitative oxidation of graphene frameworks with controllable C/O ratios and added pseudocapacitances.
abstract: We report an electrochemical oxidation route to tunable C/O ratios in the graphene framework, creating enhanced pseudocapacitance with increasing oxygen content. Controlled surface functionalities on graphene enable a high specific capacitance and negligible electric conductivity loss. A specific capacitance of up to 279 F g(-1) was achieved for the functionalized graphene at a discharge current of 1 A g(-1) in 1 M H2SO4 electrolyte; this capacitance remained as high as 152 F g(-1) at 100 A g(-1). These values are much higher than those of non-oxidized graphene. These excellent performances of the functionalized graphene signify the importance of precise control of the surface chemistry of graphene-based materials.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China.
authors.forename: Fei
authors.initials: F
authors.lastname: Liu
authors.forename: Dongfeng
authors.initials: D
authors.lastname: Xue
keywords: electrochemistry; graphene; quantitative oxidation; surface functionalities; tunable C/O ratios